Surfactant-free hydrothermal synthesis of highly tetragonal barium titanate nanowires: A structural investigation
SCIE
SCOPUS
- Title
- Surfactant-free hydrothermal synthesis of highly tetragonal barium titanate nanowires: A structural investigation
- Authors
- Joshi, UA; Yoon, SH; Baik, SG; Lee, JS
- Date Issued
- 2006-06-29
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Barium titanate nanowires synthesized with a surfactant-free hydrothermal method have been characterized by various techniques such as transmission electron microscopy (TEM), scanning electron microscopy (SEM), synchrotron X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The TEM and SEM analyses show the uniform cylindrical nanowires. The Rietveld refinement with synchrotron X-ray powder diffraction showed that the lattice parameters of cubic and tetragonal phases were a (= b = c) = 4.0134 angstrom and a (= b) = 3.9998 angstrom, c = 4.0303 angstrom, respectively. The final weighted R-factor, R-wp, was 6.75% and the goodness of fit indicator was 1.30. The mass fraction of tetragonal and cubic phases based on the refined scale factor for the two phases were 98.4% and 1.6%, respectively, which clearly show the nanowires are tetragonal. The XPS analysis has shown that as-obtained BaTiO3 nanowires were phase pure. The Raman spectra confirm the tetragonal phase of the BaTiO3 nanowires. The dielectric constant measurement shows the shift in the transition temperature (T-c = 105 degrees C) compared to the bulk transition temperature (T-c = 132 degrees C). The dielectric constant at T-c was 174 measured at 1 kHz frequency.
- Keywords
- DRIVEN PHASE-TRANSITION; ANOMALOUS LATTICE EXPANSION; ROOM-TEMPERATURE; PARTICLE-SIZE; FERROELECTRIC MEMORIES; NANOCRYSTALLINE BATIO3; DIELECTRIC-PROPERTIES; STRONTIUM-TITANATE; CRYSTAL-STRUCTURE; FINE PARTICLES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23967
- DOI
- 10.1021/JP0600110
- ISSN
- 1520-6106
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY B, vol. 110, no. 25, page. 12249 - 12256, 2006-06-29
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